Final answer:
High voltage power lines are indeed more efficient for long-distance power transmission because high voltages allow for lower currents, which in turn minimize power losses due to resistive heating in the lines.
Step-by-step explanation:
The statement that high voltage power lines are more efficient when it comes to long distance power transmissions is true.
When electrical power is transmitted over long distances, it is advantageous to use high voltages.
The reason for this is rooted in the relationship between power, current, and resistance, which can be understood with the formula P = I2R, where P is power loss, I is current, and R is resistance.
High voltage implies lower current for the same power transfer, which in turn means less power loss due to resistive heating in the lines.